Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa64f2cb609f41e3…

MALICIOUS

PDF

84.2 KB Created: 2021-09-09 09:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0ced605edfe082db46834b397f6eeb2f SHA-1: 875523f2bf20415c176ae7e331c90addae0e40ea SHA-256: aa64f2cb609f41e3a67114bdf09d0772fb3236e86826c88fbb29f05f1d072644
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs pointing to a link farm, with one URL identified as a disposable hosting link farm. The document body is heavily obfuscated and appears to be non-readable content, suggesting it's not intended for direct user interaction but rather to facilitate the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://incomingmakedonia.com/files/files/8060347391.pdf
    • http://rfinshaat.az/userfiles/file/zamekusaperopagezamo.pdf
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/kokenizukomawugijikofil.pdf
    • http://phelieuviethung.vn/upload/files/xozijirumikebawofebap.pdf
    • https://tvmreza.tv/ckfinder/userfiles/files/ferumifoz.pdf
    • http://lotusburbank.com/uploads/files/tadosefelidu.pdf
    • https://adikmanis.com/contents/files/lumed.pdf
    • https://kawanmto.com/contents/files/xanarefodepi.pdf
    • http://xn--h49al33a2zdp0eo1x.com/DATA/file/20210908032959.pdf
    • http://vom-ragnaroek.de/uploads/file/21290767653.pdf
    • http://shepardinteriordesign.com/rw/upload/file/55809712317.pdf
    • http://ntouioc.ntou.edu.tw/ckfinder/userfiles/files/28305030086.pdf
    • https://enerjimakine.com/tsrm1/img/userfiles/file/zonopewarugepisek.pdf
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/92060912921.pdf
    • http://tuvanthanhlapcongty.biz/upload/ck/files/18285971895.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/1612fca02690dc---93954560419.pdf
    • https://holcom-wd.com/webroot/img/files/zizupotop.pdf
    • http://le-nora.com/userfiles/file/zararuzusepoji.pdf
    • http://abaj.cz/UserFiles/File/81742274782.pdf
    • https://kiptep.ru/file/51079689.pdf
    • http://manisafar.com/basefile/marcosafarir/files/1631127699.pdf
    • http://basar-hemeringen.de/ablage/userfiles/files/bafin.pdf
    • http://tabouligrill.com/ckfinder/userfiles/files/1450480920.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=justin+bieber+featuring+ludacris
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e315.bin
1d131892f8339bd01d65fcb9ffec2107967ea2440834966ceb7bf246cb83e6ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE315 17752 bytes
font_01_sfnt_off000111c9.bin
7aae7836a20efe951ac6a35d7b4b53ed7593589eecbe7a19a03a51f6eb2b7fc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x111C9 10760 bytes
font_02_sfnt_off00012a85.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A85 16792 bytes

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